linux-imx

/*

 * EPSON TOYOCOM RTC-7301SF/DG Driver

 *

 * Copyright (c) 2016 Akinobu Mita <akinobu.mita@gmail.com>

 *

 * Based on rtc-rp5c01.c

 *

 * Datasheet: http://www5.epsondevice.com/en/products/parallel/rtc7301sf.html

 */

​

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/mod_devicetable.h>

#include <linux/delay.h>

#include <linux/regmap.h>

#include <linux/platform_device.h>

#include <linux/rtc.h>

​

#define DRV_NAME "rtc-r7301"

​

#define RTC7301_1_SEC       0x0 /* Bank 0 and Band 1 */

#define RTC7301_10_SEC      0x1 /* Bank 0 and Band 1 */

#define RTC7301_AE      BIT(3)

#define RTC7301_1_MIN       0x2 /* Bank 0 and Band 1 */

#define RTC7301_10_MIN      0x3 /* Bank 0 and Band 1 */

#define RTC7301_1_HOUR      0x4 /* Bank 0 and Band 1 */

#define RTC7301_10_HOUR     0x5 /* Bank 0 and Band 1 */

#define RTC7301_DAY_OF_WEEK 0x6 /* Bank 0 and Band 1 */

#define RTC7301_1_DAY       0x7 /* Bank 0 and Band 1 */

#define RTC7301_10_DAY      0x8 /* Bank 0 and Band 1 */

#define RTC7301_1_MONTH     0x9 /* Bank 0 */

#define RTC7301_10_MONTH    0xa /* Bank 0 */

#define RTC7301_1_YEAR      0xb /* Bank 0 */

#define RTC7301_10_YEAR     0xc /* Bank 0 */

#define RTC7301_100_YEAR    0xd /* Bank 0 */

#define RTC7301_1000_YEAR   0xe /* Bank 0 */

#define RTC7301_ALARM_CONTROL   0xe /* Bank 1 */

#define RTC7301_ALARM_CONTROL_AIE   BIT(0)

#define RTC7301_ALARM_CONTROL_AF    BIT(1)

#define RTC7301_TIMER_CONTROL   0xe /* Bank 2 */

#define RTC7301_TIMER_CONTROL_TIE   BIT(0)

#define RTC7301_TIMER_CONTROL_TF    BIT(1)

#define RTC7301_CONTROL     0xf /* All banks */

#define RTC7301_CONTROL_BUSY        BIT(0)

#define RTC7301_CONTROL_STOP        BIT(1)

#define RTC7301_CONTROL_BANK_SEL_0  BIT(2)

#define RTC7301_CONTROL_BANK_SEL_1  BIT(3)

​

struct rtc7301_priv {

    struct regmap *regmap;

    int irq;

    spinlock_t lock;

    u8 bank;

};

​

static const struct regmap_config rtc7301_regmap_config = {

    .reg_bits = 32,

    .val_bits = 8,

    .reg_stride = 4,

};

​

static u8 rtc7301_read(struct rtc7301_priv *priv, unsigned int reg)